Step 1:

The function is $\"\"$

Apply derivative with respect to $\"\"$ .

$\"\"$

Apply the quotient rule of derivatives $\"\"$ .

$\"\"$ $\"\"$ .

Step 2:

At the point $\"\"$ , the value of the derivative is

Substitute $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

Solution:

$\"\"$ .